The characteristic of frequency response on winding faults and configurations of transformer

This research presents a study on the monitoring of several winding configurations of power transformers using Frequency Response Analysis (FRA). The frequency response provides indications of any mechanical and electrical changes in the transformer’s active parts. Three units of three-phase transfo...

Full description

Saved in:

Bibliographic Details
Main Author:	Md. Yasid, Nurul Farahwahida
Format:	Thesis
Language:	English English English
Published:	2019
Subjects:	TK2000-2891 Dynamoelectric machinery and auxiliaries Including generators, motors, transformers
Online Access:	http://eprints.uthm.edu.my/648/1/24p%20NURUL%20FARAHWAHIDA%20MD%20YASID.pdf http://eprints.uthm.edu.my/648/2/NURUL%20FARAHWAHIDA%20MD%20YASID%20WATERMARK.pdf http://eprints.uthm.edu.my/648/3/NURUL%20FARAHWAHIDA%20MD%20YASID%20COPYRIGHT%20DECLARATION.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-uthm-ep.648
record_format	uketd_dc
spelling	my-uthm-ep.6482021-08-17T06:26:36Z The characteristic of frequency response on winding faults and configurations of transformer 2019-08 Md. Yasid, Nurul Farahwahida TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers This research presents a study on the monitoring of several winding configurations of power transformers using Frequency Response Analysis (FRA). The frequency response provides indications of any mechanical and electrical changes in the transformer’s active parts. Three units of three-phase transformers were tested with the aim to investigate their FRA responses due three case studies. They are due to vector group, three types of faulty winding and also the effect of coupling in the three-phase core-typed transformers. The tests were repeated to Dyn11 360VA, 100kVA and 500kVA core-typed transformers to carry out the desired condition scenario of the FRA responses. Transformer Turn Ratio (TTR) and winding resistance test are performed to establish the present condition of the transformers winding. The TTR test is conducted to determine the turn ratio of high voltage (HV) to the low voltage (LV) windings at no load condition. Meanwhile, winding resistance test is performed to check for gross difference between the windings. From these test results, it is found that the windings are in good condition. The first case is to investigate the characteristics of the FRA response due to different vector groups. It is found that it gives subtle to the response and mainly altering the medium frequency region. The second case study is the investigations of the effect of three types of faulty winding in the FRA response. They are performed by physically simulate the faults to the transformers. The faults are inter-turn short circuit (SC) fault, local overheating and radial deformation. The results show that the SC causes the starting magnitude to increase and the resonance at the low frequency region to shift towards higher frequencies. Meanwhile, during local overheating fault, the winding carries out additional resistance at the winding. It is found that it causes the alteration of the response at the very low frequency region. Lastly, the study found that radial deformation causes the responses to change in the mid-frequency region. The third case study is to investigate the effect of coupling in the three-phase transformers. This is performed by investigating the effect of fault at winding of other phases to the response of measured phase. It is found that faulty occurred in winding of other phases could actually affect the response of measured winding. The location of the fault determines how severe it is affecting the response. The findings from this research could be helpful in enriching the knowledge to evaluate the FRA response. 2019-08 Thesis http://eprints.uthm.edu.my/648/ http://eprints.uthm.edu.my/648/1/24p%20NURUL%20FARAHWAHIDA%20MD%20YASID.pdf text en public http://eprints.uthm.edu.my/648/2/NURUL%20FARAHWAHIDA%20MD%20YASID%20WATERMARK.pdf text en validuser http://eprints.uthm.edu.my/648/3/NURUL%20FARAHWAHIDA%20MD%20YASID%20COPYRIGHT%20DECLARATION.pdf text en staffonly mphil masters Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Elektrik dan Elektronik
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TK2000-2891 Dynamoelectric machinery and auxiliaries Including generators, motors, transformers
spellingShingle	TK2000-2891 Dynamoelectric machinery and auxiliaries Including generators, motors, transformers Md. Yasid, Nurul Farahwahida The characteristic of frequency response on winding faults and configurations of transformer
description	This research presents a study on the monitoring of several winding configurations of power transformers using Frequency Response Analysis (FRA). The frequency response provides indications of any mechanical and electrical changes in the transformer’s active parts. Three units of three-phase transformers were tested with the aim to investigate their FRA responses due three case studies. They are due to vector group, three types of faulty winding and also the effect of coupling in the three-phase core-typed transformers. The tests were repeated to Dyn11 360VA, 100kVA and 500kVA core-typed transformers to carry out the desired condition scenario of the FRA responses. Transformer Turn Ratio (TTR) and winding resistance test are performed to establish the present condition of the transformers winding. The TTR test is conducted to determine the turn ratio of high voltage (HV) to the low voltage (LV) windings at no load condition. Meanwhile, winding resistance test is performed to check for gross difference between the windings. From these test results, it is found that the windings are in good condition. The first case is to investigate the characteristics of the FRA response due to different vector groups. It is found that it gives subtle to the response and mainly altering the medium frequency region. The second case study is the investigations of the effect of three types of faulty winding in the FRA response. They are performed by physically simulate the faults to the transformers. The faults are inter-turn short circuit (SC) fault, local overheating and radial deformation. The results show that the SC causes the starting magnitude to increase and the resonance at the low frequency region to shift towards higher frequencies. Meanwhile, during local overheating fault, the winding carries out additional resistance at the winding. It is found that it causes the alteration of the response at the very low frequency region. Lastly, the study found that radial deformation causes the responses to change in the mid-frequency region. The third case study is to investigate the effect of coupling in the three-phase transformers. This is performed by investigating the effect of fault at winding of other phases to the response of measured phase. It is found that faulty occurred in winding of other phases could actually affect the response of measured winding. The location of the fault determines how severe it is affecting the response. The findings from this research could be helpful in enriching the knowledge to evaluate the FRA response.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Md. Yasid, Nurul Farahwahida
author_facet	Md. Yasid, Nurul Farahwahida
author_sort	Md. Yasid, Nurul Farahwahida
title	The characteristic of frequency response on winding faults and configurations of transformer
title_short	The characteristic of frequency response on winding faults and configurations of transformer
title_full	The characteristic of frequency response on winding faults and configurations of transformer
title_fullStr	The characteristic of frequency response on winding faults and configurations of transformer
title_full_unstemmed	The characteristic of frequency response on winding faults and configurations of transformer
title_sort	characteristic of frequency response on winding faults and configurations of transformer
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Elektrik dan Elektronik
publishDate	2019
url	http://eprints.uthm.edu.my/648/1/24p%20NURUL%20FARAHWAHIDA%20MD%20YASID.pdf http://eprints.uthm.edu.my/648/2/NURUL%20FARAHWAHIDA%20MD%20YASID%20WATERMARK.pdf http://eprints.uthm.edu.my/648/3/NURUL%20FARAHWAHIDA%20MD%20YASID%20COPYRIGHT%20DECLARATION.pdf
_version_	1747830652923805696

The characteristic of frequency response on winding faults and configurations of transformer

Similar Items